fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "meta_io.h"
  25 #include "quota.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 /**
  31  * ea_calc_size - returns the acutal number of bytes the request will take up
  32  *                (not counting any unstuffed data blocks)
  33  * @sdp:
  34  * @er:
  35  * @size:
  36  *
  37  * Returns: 1 if the EA should be stuffed
  38  */
  39
  40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                         unsigned int *size)
  42 {
  43         unsigned int jbsize = sdp->sd_jbsize;
  44
  45         /* Stuffed */
  46         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48         if (*size <= jbsize)
  49                 return 1;
  50
  51         /* Unstuffed */
  52         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55         return 0;
  56 }
  57
  58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59 {
  60         unsigned int size;
  61
  62         if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                 return -ERANGE;
  64
  65         ea_calc_size(sdp, nsize, dsize, &size);
  66
  67         /* This can only happen with 512 byte blocks */
  68         if (size > sdp->sd_jbsize)
  69                 return -ERANGE;
  70
  71         return 0;
  72 }
  73
  74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                           struct gfs2_ea_header *ea,
  76                           struct gfs2_ea_header *prev, void *private);
  77
  78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                         ea_call_t ea_call, void *data)
  80 {
  81         struct gfs2_ea_header *ea, *prev = NULL;
  82         int error = 0;
  83
  84         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                 return -EIO;
  86
  87         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                 if (!GFS2_EA_REC_LEN(ea))
  89                         goto fail;
  90                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                   bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110 fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         __be64 *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122         if (error)
 123                 return error;
 124
 125         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                 error = ea_foreach_i(ip, bh, ea_call, data);
 127                 goto out;
 128         }
 129
 130         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                 error = -EIO;
 132                 goto out;
 133         }
 134
 135         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138         for (; eablk < end; eablk++) {
 139                 u64 bn;
 140
 141                 if (!*eablk)
 142                         break;
 143                 bn = be64_to_cpu(*eablk);
 144
 145                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                 if (error)
 147                         break;
 148                 error = ea_foreach_i(ip, eabh, ea_call, data);
 149                 brelse(eabh);
 150                 if (error)
 151                         break;
 152         }
 153 out:
 154         brelse(bh);
 155         return error;
 156 }
 157
 158 struct ea_find {
 159         int type;
 160         const char *name;
 161         size_t namel;
 162         struct gfs2_ea_location *ef_el;
 163 };
 164
 165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                      void *private)
 168 {
 169         struct ea_find *ef = private;
 170
 171         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                 return 0;
 173
 174         if (ea->ea_type == ef->type) {
 175                 if (ea->ea_name_len == ef->namel &&
 176                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                         struct gfs2_ea_location *el = ef->ef_el;
 178                         get_bh(bh);
 179                         el->el_bh = bh;
 180                         el->el_ea = ea;
 181                         el->el_prev = prev;
 182                         return 1;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                  struct gfs2_ea_location *el)
 191 {
 192         struct ea_find ef;
 193         int error;
 194
 195         ef.type = type;
 196         ef.name = name;
 197         ef.namel = strlen(name);
 198         ef.ef_el = el;
 199
 200         memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202         error = ea_foreach(ip, ea_find_i, &ef);
 203         if (error > 0)
 204                 return 0;
 205
 206         return error;
 207 }
 208
 209 /**
 210  * ea_dealloc_unstuffed -
 211  * @ip:
 212  * @bh:
 213  * @ea:
 214  * @prev:
 215  * @private:
 216  *
 217  * Take advantage of the fact that all unstuffed blocks are
 218  * allocated from the same RG.  But watch, this may not always
 219  * be true.
 220  *
 221  * Returns: errno
 222  */
 223
 224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                 struct gfs2_ea_header *ea,
 226                                 struct gfs2_ea_header *prev, void *private)
 227 {
 228         int *leave = private;
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_rgrpd *rgd;
 231         struct gfs2_holder rg_gh;
 232         struct buffer_head *dibh;
 233         __be64 *dataptrs;
 234         u64 bn = 0;
 235         u64 bstart = 0;
 236         unsigned int blen = 0;
 237         unsigned int blks = 0;
 238         unsigned int x;
 239         int error;
 240
 241         if (GFS2_EA_IS_STUFFED(ea))
 242                 return 0;
 243
 244         dataptrs = GFS2_EA2DATAPTRS(ea);
 245         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 246                 if (*dataptrs) {
 247                         blks++;
 248                         bn = be64_to_cpu(*dataptrs);
 249                 }
 250         }
 251         if (!blks)
 252                 return 0;
 253
 254         rgd = gfs2_blk2rgrpd(sdp, bn);
 255         if (!rgd) {
 256                 gfs2_consist_inode(ip);
 257                 return -EIO;
 258         }
 259
 260         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 261         if (error)
 262                 return error;
 263
 264         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 265                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 266         if (error)
 267                 goto out_gunlock;
 268
 269         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 270
 271         dataptrs = GFS2_EA2DATAPTRS(ea);
 272         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 273                 if (!*dataptrs)
 274                         break;
 275                 bn = be64_to_cpu(*dataptrs);
 276
 277                 if (bstart + blen == bn)
 278                         blen++;
 279                 else {
 280                         if (bstart)
 281                                 gfs2_free_meta(ip, bstart, blen);
 282                         bstart = bn;
 283                         blen = 1;
 284                 }
 285
 286                 *dataptrs = 0;
 287                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 288         }
 289         if (bstart)
 290                 gfs2_free_meta(ip, bstart, blen);
 291
 292         if (prev && !leave) {
 293                 u32 len;
 294
 295                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 296                 prev->ea_rec_len = cpu_to_be32(len);
 297
 298                 if (GFS2_EA_IS_LAST(ea))
 299                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 300         } else {
 301                 ea->ea_type = GFS2_EATYPE_UNUSED;
 302                 ea->ea_num_ptrs = 0;
 303         }
 304
 305         error = gfs2_meta_inode_buffer(ip, &dibh);
 306         if (!error) {
 307                 ip->i_inode.i_ctime = CURRENT_TIME;
 308                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 309                 gfs2_dinode_out(ip, dibh->b_data);
 310                 brelse(dibh);
 311         }
 312
 313         gfs2_trans_end(sdp);
 314
 315 out_gunlock:
 316         gfs2_glock_dq_uninit(&rg_gh);
 317         return error;
 318 }
 319
 320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 321                                struct gfs2_ea_header *ea,
 322                                struct gfs2_ea_header *prev, int leave)
 323 {
 324         struct gfs2_alloc *al;
 325         int error;
 326
 327         al = gfs2_alloc_get(ip);
 328         if (!al)
 329                 return -ENOMEM;
 330
 331         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 332         if (error)
 333                 goto out_alloc;
 334
 335         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 336         if (error)
 337                 goto out_quota;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_glock_dq_uninit(&al->al_ri_gh);
 342
 343 out_quota:
 344         gfs2_quota_unhold(ip);
 345 out_alloc:
 346         gfs2_alloc_put(ip);
 347         return error;
 348 }
 349
 350 struct ea_list {
 351         struct gfs2_ea_request *ei_er;
 352         unsigned int ei_size;
 353 };
 354
 355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 356 {
 357         switch (ea->ea_type) {
 358         case GFS2_EATYPE_USR:
 359                 return 5 + ea->ea_name_len + 1;
 360         case GFS2_EATYPE_SYS:
 361                 return 7 + ea->ea_name_len + 1;
 362         case GFS2_EATYPE_SECURITY:
 363                 return 9 + ea->ea_name_len + 1;
 364         default:
 365                 return 0;
 366         }
 367 }
 368
 369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 370                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 371                      void *private)
 372 {
 373         struct ea_list *ei = private;
 374         struct gfs2_ea_request *er = ei->ei_er;
 375         unsigned int ea_size = gfs2_ea_strlen(ea);
 376
 377         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 378                 return 0;
 379
 380         if (er->er_data_len) {
 381                 char *prefix = NULL;
 382                 unsigned int l = 0;
 383                 char c = 0;
 384
 385                 if (ei->ei_size + ea_size > er->er_data_len)
 386                         return -ERANGE;
 387
 388                 switch (ea->ea_type) {
 389                 case GFS2_EATYPE_USR:
 390                         prefix = "user.";
 391                         l = 5;
 392                         break;
 393                 case GFS2_EATYPE_SYS:
 394                         prefix = "system.";
 395                         l = 7;
 396                         break;
 397                 case GFS2_EATYPE_SECURITY:
 398                         prefix = "security.";
 399                         l = 9;
 400                         break;
 401                 }
 402
 403                 BUG_ON(l == 0);
 404
 405                 memcpy(er->er_data + ei->ei_size, prefix, l);
 406                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 407                        ea->ea_name_len);
 408                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 409         }
 410
 411         ei->ei_size += ea_size;
 412
 413         return 0;
 414 }
 415
 416 /**
 417  * gfs2_listxattr - List gfs2 extended attributes
 418  * @dentry: The dentry whose inode we are interested in
 419  * @buffer: The buffer to write the results
 420  * @size: The size of the buffer
 421  *
 422  * Returns: actual size of data on success, -errno on error
 423  */
 424
 425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 426 {
 427         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 428         struct gfs2_ea_request er;
 429         struct gfs2_holder i_gh;
 430         int error;
 431
 432         memset(&er, 0, sizeof(struct gfs2_ea_request));
 433         if (size) {
 434                 er.er_data = buffer;
 435                 er.er_data_len = size;
 436         }
 437
 438         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 439         if (error)
 440                 return error;
 441
 442         if (ip->i_eattr) {
 443                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 444
 445                 error = ea_foreach(ip, ea_list_i, &ei);
 446                 if (!error)
 447                         error = ei.ei_size;
 448         }
 449
 450         gfs2_glock_dq_uninit(&i_gh);
 451
 452         return error;
 453 }
 454
 455 /**
 456  * ea_get_unstuffed - actually copies the unstuffed data into the
 457  *                    request buffer
 458  * @ip: The GFS2 inode
 459  * @ea: The extended attribute header structure
 460  * @data: The data to be copied
 461  *
 462  * Returns: errno
 463  */
 464
 465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 466                             char *data)
 467 {
 468         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 469         struct buffer_head **bh;
 470         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 471         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 472         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 473         unsigned int x;
 474         int error = 0;
 475
 476         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 477         if (!bh)
 478                 return -ENOMEM;
 479
 480         for (x = 0; x < nptrs; x++) {
 481                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 482                                        bh + x);
 483                 if (error) {
 484                         while (x--)
 485                                 brelse(bh[x]);
 486                         goto out;
 487                 }
 488                 dataptrs++;
 489         }
 490
 491         for (x = 0; x < nptrs; x++) {
 492                 error = gfs2_meta_wait(sdp, bh[x]);
 493                 if (error) {
 494                         for (; x < nptrs; x++)
 495                                 brelse(bh[x]);
 496                         goto out;
 497                 }
 498                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 499                         for (; x < nptrs; x++)
 500                                 brelse(bh[x]);
 501                         error = -EIO;
 502                         goto out;
 503                 }
 504
 505                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 506                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 507
 508                 amount -= sdp->sd_jbsize;
 509                 data += sdp->sd_jbsize;
 510
 511                 brelse(bh[x]);
 512         }
 513
 514 out:
 515         kfree(bh);
 516         return error;
 517 }
 518
 519 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 520                      char *data, size_t size)
 521 {
 522         int ret;
 523         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 524         if (len > size)
 525                 return -ERANGE;
 526
 527         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 528                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 529                 return len;
 530         }
 531         ret = ea_get_unstuffed(ip, el->el_ea, data);
 532         if (ret < 0)
 533                 return ret;
 534         return len;
 535 }
 536
 537 /**
 538  * gfs2_xattr_get - Get a GFS2 extended attribute
 539  * @inode: The inode
 540  * @type: The type of extended attribute
 541  * @name: The name of the extended attribute
 542  * @buffer: The buffer to write the result into
 543  * @size: The size of the buffer
 544  *
 545  * Returns: actual size of data on success, -errno on error
 546  */
 547
 548 int gfs2_xattr_get(struct inode *inode, int type, const char *name,
 549                    void *buffer, size_t size)
 550 {
 551         struct gfs2_inode *ip = GFS2_I(inode);
 552         struct gfs2_ea_location el;
 553         int error;
 554
 555         if (!ip->i_eattr)
 556                 return -ENODATA;
 557         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 558                 return -EINVAL;
 559
 560         error = gfs2_ea_find(ip, type, name, &el);
 561         if (error)
 562                 return error;
 563         if (!el.el_ea)
 564                 return -ENODATA;
 565         if (size)
 566                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 567         else
 568                 error = GFS2_EA_DATA_LEN(el.el_ea);
 569         brelse(el.el_bh);
 570
 571         return error;
 572 }
 573
 574 /**
 575  * ea_alloc_blk - allocates a new block for extended attributes.
 576  * @ip: A pointer to the inode that's getting extended attributes
 577  * @bhp: Pointer to pointer to a struct buffer_head
 578  *
 579  * Returns: errno
 580  */
 581
 582 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 583 {
 584         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 585         struct gfs2_ea_header *ea;
 586         unsigned int n = 1;
 587         u64 block;
 588         int error;
 589
 590         error = gfs2_alloc_block(ip, &block, &n);
 591         if (error)
 592                 return error;
 593         gfs2_trans_add_unrevoke(sdp, block, 1);
 594         *bhp = gfs2_meta_new(ip->i_gl, block);
 595         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 596         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 597         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 598
 599         ea = GFS2_EA_BH2FIRST(*bhp);
 600         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 601         ea->ea_type = GFS2_EATYPE_UNUSED;
 602         ea->ea_flags = GFS2_EAFLAG_LAST;
 603         ea->ea_num_ptrs = 0;
 604
 605         gfs2_add_inode_blocks(&ip->i_inode, 1);
 606
 607         return 0;
 608 }
 609
 610 /**
 611  * ea_write - writes the request info to an ea, creating new blocks if
 612  *            necessary
 613  * @ip: inode that is being modified
 614  * @ea: the location of the new ea in a block
 615  * @er: the write request
 616  *
 617  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 618  *
 619  * returns : errno
 620  */
 621
 622 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 623                     struct gfs2_ea_request *er)
 624 {
 625         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 626         int error;
 627
 628         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 629         ea->ea_name_len = er->er_name_len;
 630         ea->ea_type = er->er_type;
 631         ea->__pad = 0;
 632
 633         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 634
 635         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 636                 ea->ea_num_ptrs = 0;
 637                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 638         } else {
 639                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 640                 const char *data = er->er_data;
 641                 unsigned int data_len = er->er_data_len;
 642                 unsigned int copy;
 643                 unsigned int x;
 644
 645                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 646                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 647                         struct buffer_head *bh;
 648                         u64 block;
 649                         int mh_size = sizeof(struct gfs2_meta_header);
 650                         unsigned int n = 1;
 651
 652                         error = gfs2_alloc_block(ip, &block, &n);
 653                         if (error)
 654                                 return error;
 655                         gfs2_trans_add_unrevoke(sdp, block, 1);
 656                         bh = gfs2_meta_new(ip->i_gl, block);
 657                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 658                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 659
 660                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 661
 662                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 663                                                            data_len;
 664                         memcpy(bh->b_data + mh_size, data, copy);
 665                         if (copy < sdp->sd_jbsize)
 666                                 memset(bh->b_data + mh_size + copy, 0,
 667                                        sdp->sd_jbsize - copy);
 668
 669                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 670                         data += copy;
 671                         data_len -= copy;
 672
 673                         brelse(bh);
 674                 }
 675
 676                 gfs2_assert_withdraw(sdp, !data_len);
 677         }
 678
 679         return 0;
 680 }
 681
 682 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 683                                    struct gfs2_ea_request *er, void *private);
 684
 685 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 686                              unsigned int blks,
 687                              ea_skeleton_call_t skeleton_call, void *private)
 688 {
 689         struct gfs2_alloc *al;
 690         struct buffer_head *dibh;
 691         int error;
 692
 693         al = gfs2_alloc_get(ip);
 694         if (!al)
 695                 return -ENOMEM;
 696
 697         error = gfs2_quota_lock_check(ip);
 698         if (error)
 699                 goto out;
 700
 701         al->al_requested = blks;
 702
 703         error = gfs2_inplace_reserve(ip);
 704         if (error)
 705                 goto out_gunlock_q;
 706
 707         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 708                                  blks + al->al_rgd->rd_length +
 709                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 710         if (error)
 711                 goto out_ipres;
 712
 713         error = skeleton_call(ip, er, private);
 714         if (error)
 715                 goto out_end_trans;
 716
 717         error = gfs2_meta_inode_buffer(ip, &dibh);
 718         if (!error) {
 719                 ip->i_inode.i_ctime = CURRENT_TIME;
 720                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 721                 gfs2_dinode_out(ip, dibh->b_data);
 722                 brelse(dibh);
 723         }
 724
 725 out_end_trans:
 726         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 727 out_ipres:
 728         gfs2_inplace_release(ip);
 729 out_gunlock_q:
 730         gfs2_quota_unlock(ip);
 731 out:
 732         gfs2_alloc_put(ip);
 733         return error;
 734 }
 735
 736 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 737                      void *private)
 738 {
 739         struct buffer_head *bh;
 740         int error;
 741
 742         error = ea_alloc_blk(ip, &bh);
 743         if (error)
 744                 return error;
 745
 746         ip->i_eattr = bh->b_blocknr;
 747         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 748
 749         brelse(bh);
 750
 751         return error;
 752 }
 753
 754 /**
 755  * ea_init - initializes a new eattr block
 756  * @ip:
 757  * @er:
 758  *
 759  * Returns: errno
 760  */
 761
 762 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 763                    const void *data, size_t size)
 764 {
 765         struct gfs2_ea_request er;
 766         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 767         unsigned int blks = 1;
 768
 769         er.er_type = type;
 770         er.er_name = name;
 771         er.er_name_len = strlen(name);
 772         er.er_data = (void *)data;
 773         er.er_data_len = size;
 774
 775         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 776                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 777
 778         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 779 }
 780
 781 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 782 {
 783         u32 ea_size = GFS2_EA_SIZE(ea);
 784         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 785                                      ea_size);
 786         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 787         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 788
 789         ea->ea_rec_len = cpu_to_be32(ea_size);
 790         ea->ea_flags ^= last;
 791
 792         new->ea_rec_len = cpu_to_be32(new_size);
 793         new->ea_flags = last;
 794
 795         return new;
 796 }
 797
 798 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 799                                   struct gfs2_ea_location *el)
 800 {
 801         struct gfs2_ea_header *ea = el->el_ea;
 802         struct gfs2_ea_header *prev = el->el_prev;
 803         u32 len;
 804
 805         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 806
 807         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 808                 ea->ea_type = GFS2_EATYPE_UNUSED;
 809                 return;
 810         } else if (GFS2_EA2NEXT(prev) != ea) {
 811                 prev = GFS2_EA2NEXT(prev);
 812                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 813         }
 814
 815         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 816         prev->ea_rec_len = cpu_to_be32(len);
 817
 818         if (GFS2_EA_IS_LAST(ea))
 819                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 820 }
 821
 822 struct ea_set {
 823         int ea_split;
 824
 825         struct gfs2_ea_request *es_er;
 826         struct gfs2_ea_location *es_el;
 827
 828         struct buffer_head *es_bh;
 829         struct gfs2_ea_header *es_ea;
 830 };
 831
 832 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 833                                  struct gfs2_ea_header *ea, struct ea_set *es)
 834 {
 835         struct gfs2_ea_request *er = es->es_er;
 836         struct buffer_head *dibh;
 837         int error;
 838
 839         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 840         if (error)
 841                 return error;
 842
 843         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 844
 845         if (es->ea_split)
 846                 ea = ea_split_ea(ea);
 847
 848         ea_write(ip, ea, er);
 849
 850         if (es->es_el)
 851                 ea_set_remove_stuffed(ip, es->es_el);
 852
 853         error = gfs2_meta_inode_buffer(ip, &dibh);
 854         if (error)
 855                 goto out;
 856         ip->i_inode.i_ctime = CURRENT_TIME;
 857         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 858         gfs2_dinode_out(ip, dibh->b_data);
 859         brelse(dibh);
 860 out:
 861         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 862         return error;
 863 }
 864
 865 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 866                                struct gfs2_ea_request *er, void *private)
 867 {
 868         struct ea_set *es = private;
 869         struct gfs2_ea_header *ea = es->es_ea;
 870         int error;
 871
 872         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 873
 874         if (es->ea_split)
 875                 ea = ea_split_ea(ea);
 876
 877         error = ea_write(ip, ea, er);
 878         if (error)
 879                 return error;
 880
 881         if (es->es_el)
 882                 ea_set_remove_stuffed(ip, es->es_el);
 883
 884         return 0;
 885 }
 886
 887 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 888                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 889                          void *private)
 890 {
 891         struct ea_set *es = private;
 892         unsigned int size;
 893         int stuffed;
 894         int error;
 895
 896         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 897                                es->es_er->er_data_len, &size);
 898
 899         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 900                 if (GFS2_EA_REC_LEN(ea) < size)
 901                         return 0;
 902                 if (!GFS2_EA_IS_STUFFED(ea)) {
 903                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 904                         if (error)
 905                                 return error;
 906                 }
 907                 es->ea_split = 0;
 908         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 909                 es->ea_split = 1;
 910         else
 911                 return 0;
 912
 913         if (stuffed) {
 914                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 915                 if (error)
 916                         return error;
 917         } else {
 918                 unsigned int blks;
 919
 920                 es->es_bh = bh;
 921                 es->es_ea = ea;
 922                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 923                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 924
 925                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 926                                           ea_set_simple_alloc, es);
 927                 if (error)
 928                         return error;
 929         }
 930
 931         return 1;
 932 }
 933
 934 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 935                         void *private)
 936 {
 937         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 938         struct buffer_head *indbh, *newbh;
 939         __be64 *eablk;
 940         int error;
 941         int mh_size = sizeof(struct gfs2_meta_header);
 942
 943         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 944                 __be64 *end;
 945
 946                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 947                                        &indbh);
 948                 if (error)
 949                         return error;
 950
 951                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 952                         error = -EIO;
 953                         goto out;
 954                 }
 955
 956                 eablk = (__be64 *)(indbh->b_data + mh_size);
 957                 end = eablk + sdp->sd_inptrs;
 958
 959                 for (; eablk < end; eablk++)
 960                         if (!*eablk)
 961                                 break;
 962
 963                 if (eablk == end) {
 964                         error = -ENOSPC;
 965                         goto out;
 966                 }
 967
 968                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 969         } else {
 970                 u64 blk;
 971                 unsigned int n = 1;
 972                 error = gfs2_alloc_block(ip, &blk, &n);
 973                 if (error)
 974                         return error;
 975                 gfs2_trans_add_unrevoke(sdp, blk, 1);
 976                 indbh = gfs2_meta_new(ip->i_gl, blk);
 977                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 978                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 979                 gfs2_buffer_clear_tail(indbh, mh_size);
 980
 981                 eablk = (__be64 *)(indbh->b_data + mh_size);
 982                 *eablk = cpu_to_be64(ip->i_eattr);
 983                 ip->i_eattr = blk;
 984                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
 985                 gfs2_add_inode_blocks(&ip->i_inode, 1);
 986
 987                 eablk++;
 988         }
 989
 990         error = ea_alloc_blk(ip, &newbh);
 991         if (error)
 992                 goto out;
 993
 994         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
 995         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
 996         brelse(newbh);
 997         if (error)
 998                 goto out;
 999
1000         if (private)
1001                 ea_set_remove_stuffed(ip, private);
1002
1003 out:
1004         brelse(indbh);
1005         return error;
1006 }
1007
1008 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1009                     const void *value, size_t size, struct gfs2_ea_location *el)
1010 {
1011         struct gfs2_ea_request er;
1012         struct ea_set es;
1013         unsigned int blks = 2;
1014         int error;
1015
1016         er.er_type = type;
1017         er.er_name = name;
1018         er.er_data = (void *)value;
1019         er.er_name_len = strlen(name);
1020         er.er_data_len = size;
1021
1022         memset(&es, 0, sizeof(struct ea_set));
1023         es.es_er = &er;
1024         es.es_el = el;
1025
1026         error = ea_foreach(ip, ea_set_simple, &es);
1027         if (error > 0)
1028                 return 0;
1029         if (error)
1030                 return error;
1031
1032         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1033                 blks++;
1034         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1035                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1036
1037         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1038 }
1039
1040 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1041                                    struct gfs2_ea_location *el)
1042 {
1043         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1044                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1045                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1046                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1047         }
1048
1049         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1050 }
1051
1052 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1053 {
1054         struct gfs2_ea_header *ea = el->el_ea;
1055         struct gfs2_ea_header *prev = el->el_prev;
1056         struct buffer_head *dibh;
1057         int error;
1058
1059         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1060         if (error)
1061                 return error;
1062
1063         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1064
1065         if (prev) {
1066                 u32 len;
1067
1068                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1069                 prev->ea_rec_len = cpu_to_be32(len);
1070
1071                 if (GFS2_EA_IS_LAST(ea))
1072                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1073         } else {
1074                 ea->ea_type = GFS2_EATYPE_UNUSED;
1075         }
1076
1077         error = gfs2_meta_inode_buffer(ip, &dibh);
1078         if (!error) {
1079                 ip->i_inode.i_ctime = CURRENT_TIME;
1080                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1081                 gfs2_dinode_out(ip, dibh->b_data);
1082                 brelse(dibh);
1083         }
1084
1085         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1086
1087         return error;
1088 }
1089
1090 /**
1091  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1092  * @inode: The inode
1093  * @type: The type of the extended attribute
1094  * @name: The name of the extended attribute
1095  *
1096  * This is not called directly by the VFS since we use the (common)
1097  * scheme of making a "set with NULL data" mean a remove request. Note
1098  * that this is different from a set with zero length data.
1099  *
1100  * Returns: 0, or errno on failure
1101  */
1102
1103 static int gfs2_xattr_remove(struct inode *inode, int type, const char *name)
1104 {
1105         struct gfs2_inode *ip = GFS2_I(inode);
1106         struct gfs2_ea_location el;
1107         int error;
1108
1109         if (!ip->i_eattr)
1110                 return -ENODATA;
1111
1112         error = gfs2_ea_find(ip, type, name, &el);
1113         if (error)
1114                 return error;
1115         if (!el.el_ea)
1116                 return -ENODATA;
1117
1118         if (GFS2_EA_IS_STUFFED(el.el_ea))
1119                 error = ea_remove_stuffed(ip, &el);
1120         else
1121                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1122
1123         brelse(el.el_bh);
1124
1125         return error;
1126 }
1127
1128 /**
1129  * gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1130  * @inode: The inode
1131  * @type: The type of the extended attribute
1132  * @name: The name of the extended attribute
1133  * @value: The value of the extended attribute (NULL for remove)
1134  * @size: The size of the @value argument
1135  * @flags: Create or Replace
1136  *
1137  * See gfs2_xattr_remove() for details of the removal of xattrs.
1138  *
1139  * Returns: 0 or errno on failure
1140  */
1141
1142 int gfs2_xattr_set(struct inode *inode, int type, const char *name,
1143                    const void *value, size_t size, int flags)
1144 {
1145         struct gfs2_sbd *sdp = GFS2_SB(inode);
1146         struct gfs2_inode *ip = GFS2_I(inode);
1147         struct gfs2_ea_location el;
1148         unsigned int namel = strlen(name);
1149         int error;
1150
1151         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1152                 return -EPERM;
1153         if (namel > GFS2_EA_MAX_NAME_LEN)
1154                 return -ERANGE;
1155
1156         if (value == NULL)
1157                 return gfs2_xattr_remove(inode, type, name);
1158
1159         if (ea_check_size(sdp, namel, size))
1160                 return -ERANGE;
1161
1162         if (!ip->i_eattr) {
1163                 if (flags & XATTR_REPLACE)
1164                         return -ENODATA;
1165                 return ea_init(ip, type, name, value, size);
1166         }
1167
1168         error = gfs2_ea_find(ip, type, name, &el);
1169         if (error)
1170                 return error;
1171
1172         if (el.el_ea) {
1173                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1174                         brelse(el.el_bh);
1175                         return -EPERM;
1176                 }
1177
1178                 error = -EEXIST;
1179                 if (!(flags & XATTR_CREATE)) {
1180                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1181                         error = ea_set_i(ip, type, name, value, size, &el);
1182                         if (!error && unstuffed)
1183                                 ea_set_remove_unstuffed(ip, &el);
1184                 }
1185
1186                 brelse(el.el_bh);
1187                 return error;
1188         }
1189
1190         error = -ENODATA;
1191         if (!(flags & XATTR_REPLACE))
1192                 error = ea_set_i(ip, type, name, value, size, NULL);
1193
1194         return error;
1195 }
1196
1197 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1198                                   struct gfs2_ea_header *ea, char *data)
1199 {
1200         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1201         struct buffer_head **bh;
1202         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1203         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1204         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1205         unsigned int x;
1206         int error;
1207
1208         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1209         if (!bh)
1210                 return -ENOMEM;
1211
1212         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1213         if (error)
1214                 goto out;
1215
1216         for (x = 0; x < nptrs; x++) {
1217                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1218                                        bh + x);
1219                 if (error) {
1220                         while (x--)
1221                                 brelse(bh[x]);
1222                         goto fail;
1223                 }
1224                 dataptrs++;
1225         }
1226
1227         for (x = 0; x < nptrs; x++) {
1228                 error = gfs2_meta_wait(sdp, bh[x]);
1229                 if (error) {
1230                         for (; x < nptrs; x++)
1231                                 brelse(bh[x]);
1232                         goto fail;
1233                 }
1234                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1235                         for (; x < nptrs; x++)
1236                                 brelse(bh[x]);
1237                         error = -EIO;
1238                         goto fail;
1239                 }
1240
1241                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1242
1243                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1244                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1245
1246                 amount -= sdp->sd_jbsize;
1247                 data += sdp->sd_jbsize;
1248
1249                 brelse(bh[x]);
1250         }
1251
1252 out:
1253         kfree(bh);
1254         return error;
1255
1256 fail:
1257         gfs2_trans_end(sdp);
1258         kfree(bh);
1259         return error;
1260 }
1261
1262 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1263                       struct iattr *attr, char *data)
1264 {
1265         struct buffer_head *dibh;
1266         int error;
1267
1268         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1269                 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1270                 if (error)
1271                         return error;
1272
1273                 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1274                 memcpy(GFS2_EA2DATA(el->el_ea), data,
1275                        GFS2_EA_DATA_LEN(el->el_ea));
1276         } else
1277                 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1278
1279         if (error)
1280                 return error;
1281
1282         error = gfs2_meta_inode_buffer(ip, &dibh);
1283         if (!error) {
1284                 error = inode_setattr(&ip->i_inode, attr);
1285                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1286                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1287                 gfs2_dinode_out(ip, dibh->b_data);
1288                 brelse(dibh);
1289         }
1290
1291         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1292
1293         return error;
1294 }
1295
1296 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1297 {
1298         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1299         struct gfs2_rgrp_list rlist;
1300         struct buffer_head *indbh, *dibh;
1301         __be64 *eablk, *end;
1302         unsigned int rg_blocks = 0;
1303         u64 bstart = 0;
1304         unsigned int blen = 0;
1305         unsigned int blks = 0;
1306         unsigned int x;
1307         int error;
1308
1309         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1310
1311         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1312         if (error)
1313                 return error;
1314
1315         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1316                 error = -EIO;
1317                 goto out;
1318         }
1319
1320         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1321         end = eablk + sdp->sd_inptrs;
1322
1323         for (; eablk < end; eablk++) {
1324                 u64 bn;
1325
1326                 if (!*eablk)
1327                         break;
1328                 bn = be64_to_cpu(*eablk);
1329
1330                 if (bstart + blen == bn)
1331                         blen++;
1332                 else {
1333                         if (bstart)
1334                                 gfs2_rlist_add(sdp, &rlist, bstart);
1335                         bstart = bn;
1336                         blen = 1;
1337                 }
1338                 blks++;
1339         }
1340         if (bstart)
1341                 gfs2_rlist_add(sdp, &rlist, bstart);
1342         else
1343                 goto out;
1344
1345         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1346
1347         for (x = 0; x < rlist.rl_rgrps; x++) {
1348                 struct gfs2_rgrpd *rgd;
1349                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1350                 rg_blocks += rgd->rd_length;
1351         }
1352
1353         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1354         if (error)
1355                 goto out_rlist_free;
1356
1357         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1358                                  RES_STATFS + RES_QUOTA, blks);
1359         if (error)
1360                 goto out_gunlock;
1361
1362         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1363
1364         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1365         bstart = 0;
1366         blen = 0;
1367
1368         for (; eablk < end; eablk++) {
1369                 u64 bn;
1370
1371                 if (!*eablk)
1372                         break;
1373                 bn = be64_to_cpu(*eablk);
1374
1375                 if (bstart + blen == bn)
1376                         blen++;
1377                 else {
1378                         if (bstart)
1379                                 gfs2_free_meta(ip, bstart, blen);
1380                         bstart = bn;
1381                         blen = 1;
1382                 }
1383
1384                 *eablk = 0;
1385                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1386         }
1387         if (bstart)
1388                 gfs2_free_meta(ip, bstart, blen);
1389
1390         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1391
1392         error = gfs2_meta_inode_buffer(ip, &dibh);
1393         if (!error) {
1394                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1395                 gfs2_dinode_out(ip, dibh->b_data);
1396                 brelse(dibh);
1397         }
1398
1399         gfs2_trans_end(sdp);
1400
1401 out_gunlock:
1402         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1403 out_rlist_free:
1404         gfs2_rlist_free(&rlist);
1405 out:
1406         brelse(indbh);
1407         return error;
1408 }
1409
1410 static int ea_dealloc_block(struct gfs2_inode *ip)
1411 {
1412         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1413         struct gfs2_alloc *al = ip->i_alloc;
1414         struct gfs2_rgrpd *rgd;
1415         struct buffer_head *dibh;
1416         int error;
1417
1418         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1419         if (!rgd) {
1420                 gfs2_consist_inode(ip);
1421                 return -EIO;
1422         }
1423
1424         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1425                                    &al->al_rgd_gh);
1426         if (error)
1427                 return error;
1428
1429         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1430                                  RES_QUOTA, 1);
1431         if (error)
1432                 goto out_gunlock;
1433
1434         gfs2_free_meta(ip, ip->i_eattr, 1);
1435
1436         ip->i_eattr = 0;
1437         gfs2_add_inode_blocks(&ip->i_inode, -1);
1438
1439         error = gfs2_meta_inode_buffer(ip, &dibh);
1440         if (!error) {
1441                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1442                 gfs2_dinode_out(ip, dibh->b_data);
1443                 brelse(dibh);
1444         }
1445
1446         gfs2_trans_end(sdp);
1447
1448 out_gunlock:
1449         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1450         return error;
1451 }
1452
1453 /**
1454  * gfs2_ea_dealloc - deallocate the extended attribute fork
1455  * @ip: the inode
1456  *
1457  * Returns: errno
1458  */
1459
1460 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1461 {
1462         struct gfs2_alloc *al;
1463         int error;
1464
1465         al = gfs2_alloc_get(ip);
1466         if (!al)
1467                 return -ENOMEM;
1468
1469         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1470         if (error)
1471                 goto out_alloc;
1472
1473         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1474         if (error)
1475                 goto out_quota;
1476
1477         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1478         if (error)
1479                 goto out_rindex;
1480
1481         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1482                 error = ea_dealloc_indirect(ip);
1483                 if (error)
1484                         goto out_rindex;
1485         }
1486
1487         error = ea_dealloc_block(ip);
1488
1489 out_rindex:
1490         gfs2_glock_dq_uninit(&al->al_ri_gh);
1491 out_quota:
1492         gfs2_quota_unhold(ip);
1493 out_alloc:
1494         gfs2_alloc_put(ip);
1495         return error;
1496 }
1497
1498 static int gfs2_xattr_user_get(struct inode *inode, const char *name,
1499                                void *buffer, size_t size)
1500 {
1501         return gfs2_xattr_get(inode, GFS2_EATYPE_USR, name, buffer, size);
1502 }
1503
1504 static int gfs2_xattr_user_set(struct inode *inode, const char *name,
1505                                const void *value, size_t size, int flags)
1506 {
1507         return gfs2_xattr_set(inode, GFS2_EATYPE_USR, name, value, size, flags);
1508 }
1509
1510 static int gfs2_xattr_system_get(struct inode *inode, const char *name,
1511                                  void *buffer, size_t size)
1512 {
1513         return gfs2_xattr_get(inode, GFS2_EATYPE_SYS, name, buffer, size);
1514 }
1515
1516 static int gfs2_xattr_system_set(struct inode *inode, const char *name,
1517                                  const void *value, size_t size, int flags)
1518 {
1519         return gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, value, size, flags);
1520 }
1521
1522 static int gfs2_xattr_security_get(struct inode *inode, const char *name,
1523                                    void *buffer, size_t size)
1524 {
1525         return gfs2_xattr_get(inode, GFS2_EATYPE_SECURITY, name, buffer, size);
1526 }
1527
1528 static int gfs2_xattr_security_set(struct inode *inode, const char *name,
1529                                    const void *value, size_t size, int flags)
1530 {
1531         return gfs2_xattr_set(inode, GFS2_EATYPE_SECURITY, name, value, size, flags);
1532 }
1533
1534 static struct xattr_handler gfs2_xattr_user_handler = {
1535         .prefix = XATTR_USER_PREFIX,
1536         .get    = gfs2_xattr_user_get,
1537         .set    = gfs2_xattr_user_set,
1538 };
1539
1540 static struct xattr_handler gfs2_xattr_security_handler = {
1541         .prefix = XATTR_SECURITY_PREFIX,
1542         .get    = gfs2_xattr_security_get,
1543         .set    = gfs2_xattr_security_set,
1544 };
1545
1546 static struct xattr_handler gfs2_xattr_system_handler = {
1547         .prefix = XATTR_SYSTEM_PREFIX,
1548         .get    = gfs2_xattr_system_get,
1549         .set    = gfs2_xattr_system_set,
1550 };
1551
1552 struct xattr_handler *gfs2_xattr_handlers[] = {
1553         &gfs2_xattr_user_handler,
1554         &gfs2_xattr_security_handler,
1555         &gfs2_xattr_system_handler,
1556         NULL,
1557 };
1558